Significant Figures In an expression

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Solution

Q.
In an expression $a \times 10^{b}$ [2024]

1 $a$ is order of magnitude for $b \leq 5$

2 b is order of magnitude for $5 < a \leq 10$

3 b is order of magnitude for $a \geq 5$

4 b is order of magnitude for $a \leq 5$

Ans.
(4)

$a \times 10^{b}$

if $a \leq 5$ order is $b$

$a > 5$ order is $b + 1$

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